[Paraview] Opacity Issues

Wed Jun 29 03:48:02 EDT 2016

Hi Dave,

I tested the patch by simply replacing the two modified files and the new peeling worked with parallel rendering. I noticed, however, that I cannot load any state files saved before the patch application (or even from previous versions), Paraview segfaulted each time. I did not investigate the matter any further but perhaps you could double check that there is no backward compatibility issue with older state files that do have opacity information. In addition the peeling, regardless whether it’s the old or new implementation, takes significantly more time with parallel rendering than in the serial mode. Although, it’s expectable, the overhead is suspiciously high, I tried on 8 processes and a geometry which, in serial mode can be made opaque dynamically with no visible delay, took 34 seconds to be rendered. Most of the overhead comes from parallel distribution for compositing.

Regards,
Lukasz

[Beschreibung: Beschreibung: Description : cid:image001.png at 01CF0B8F.DB7831F0]
Łukasz Paluszek
Airbus Helicopters
Aerodynamics Department (ETGA)
86607 Donauwörth
Germany
Tel.: +49 (90) 671 8231
Fax.: +49 (90) 671 9122
Lukasz.Paluszek at airbus.com<mailto:Lukasz.Paluszek at airbus.com>

From: David Lonie [mailto:david.lonie at kitware.com]
Sent: 27 June 2016 21:34
To: Paluszek, Lukasz
Cc: paraview at paraview.org
Subject: Re: [Paraview] Opacity Issues

This patch fixes the remote-rendering issue in the new peeling implementation:

https://gitlab.kitware.com/vtk/vtk/merge_requests/1589

Cheers,
Dave

On Mon, Jun 27, 2016 at 6:06 AM, Paluszek, Lukasz <lukasz.paluszek at airbus.com<mailto:lukasz.paluszek at airbus.com>> wrote:
Switching to the old peeling implementation did the trick, no more issues and yes I am using remote rendering via pvserver.

[Beschreibung: Beschreibung: Description : cid:image001.png at 01CF0B8F.DB7831F0]
Łukasz Paluszek
Airbus Helicopters
Aerodynamics Department (ETGA)
86607 Donauwörth
Germany
Tel.: +49 (90) 671 8231<tel:%2B49%20%2890%29%20671%208231>
Fax.: +49 (90) 671 9122
Lukasz.Paluszek at airbus.com<mailto:Lukasz.Paluszek at airbus.com>

From: David Lonie [mailto:david.lonie at kitware.com<mailto:david.lonie at kitware.com>]
Sent: 24 June 2016 21:22
To: Paluszek, Lukasz
Cc: paraview at paraview.org<mailto:paraview at paraview.org>
Subject: Re: [Paraview] Opacity Issues

On Fri, Jun 24, 2016 at 2:15 PM, David Lonie <david.lonie at kitware.com<mailto:david.lonie at kitware.com>> wrote:
On Fri, Jun 24, 2016 at 1:10 PM, Paluszek, Lukasz <lukasz.paluszek at airbus.com<mailto:lukasz.paluszek at airbus.com>> wrote:
It doesn’t happen all the time, I suppose you need a fairly large surface dataset. I managed to reproduce the problem on a wavelet source (attached state file), try increasing the number of elements if you do not see any artifacts. I have bult Paraview from source on OpenSuse 13.1 but also cross-checked with the Linux binaries from Paraview.org and had same issues. There was no problem with the osmesa-llvm flavor though.

I couldn't reproduce this here on arch linux with a newer nVidia driver (367.27), so I'm suspicious that this is a driver bug that's affecting the new depth peeling implementation.

Since you're building from source, can you try editing VTK/Rendering/OpenGL2/vtkOpenGLRenderer.cxx, and change line 322

if (dualDepthPeelingSupported)

to

if (false)

in DeviceRenderTranslucentPolygonalGeometry, recompile using the OpenGL2 backend, and let me know if the issue goes away? I suspect it will since both the OpenGL1 backend and OpenGL2 mesa/llvm do not use the new code.

I'll put together a patch to force the older peeling implementation via an environment variable to make the work-around easier to apply.

Patch is here: https://gitlab.kitware.com/vtk/vtk/merge_requests/1589

By the way, are you running paraview with remote rendering via pvserver? I was just made aware of a similar issue with remote rendering and depth peeling.

Dave

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AIRBUS HELICOPTERS DEUTSCHLAND GmbH

Sitz der Gesellschaft / Registered Office: Donauwörth

Registergericht / Registration Court: Amtsgericht Augsburg HRB 16508

Vorsitzender des Aufsichtsrates / Chairman of the Supervisory Board: Guillaume Faury

Geschäftsführung / Board of Management: Dr. Wolfgang Schoder, Vorsitzender / CEO; Thomas Hundt; Johannes Kleidorfer; Dr. Klaus Przemeck; Martin Schübel; Stefan Thomé

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